Modular storage container



FIG. 1 is a front, right, and top perspective view of an ornamental design for a modular storage container according to the present teachings;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is the left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an exploded, front, right, and top perspective view thereof.

The broken lines shown in the drawings illustrate portions of the article and form no part of the claimed design. 

The ornamental design for a modular storage container, as shown and described. 